Rifling twist rate question

I didnt know where else to ask this, hope its ok here. If not, feel free to relocate.

I reload a .223 round.
It uses a 55grn bullet.

I fire that round thru a 24" barrel with a 1:12 twist rate,
I fire the EXACT same loaded round thru a 20" barrel with a 1:9 twist rate.

QUESTION....

What would results be as far as accuracy, at 100 yds ?,
Keep in mind, EVERYTHING is exactly the same, except the barrel length and rate of twist.

I have my own thoughts/opinion, but would like to hear from you guys.

Anybody here that can shed any light on this?
What do you think would change, if anything ?

Jim

 

Im not really talking about stabilizing a particular bullet.
I understand that a 90 grn.223 bullet out of a 1:14 twist barrel simply will not stabilize.

What Im seeking, I think, is .....
with all things being exactly the same, except the barrel length and rate of twist, how would accuracy be affected at 100 yds.

Using a 24 " barrel with 1:12 twist
Using a 20 " barrel with 1:9 twist

this is just something Im thinking about, as for deciding to make a purchase of a .223 coyote rifle.
All .223 rifles I own now, are 1: 9 twist, am looking at a rifle with 1:12 twist.

I may have to just go ahead and purchase it, and try my reloads until I MAY find one that works equally well in both,if thats even possible.

thanks for replying win94.

Jim

 

Will I be able to take either of these two barrels, use exactly the same bullet weight ,55 gr, and sucessfully dial in sub MOA shots ? At exactly same distance?

Jim

 

Thanks for the reply.

I was thinking it would.

But I think you would see a difference in them at 5-6 hundred yds.


Jim

 

You are exactly right, I did.

I should have said , I would like to see what the diiference would be at longer distances.

we agree on the initial question of what would happen at 100 yds, with 55 gr bullet from the 2 barrels.

I think you would see different outcome ,if you change that bullet to a 70gr bullet.
agree?


Jim

 

I think you are backing up my thinking.

I think you would have accuracy problems at almost any distance, if you shoot a 77gr or 80 gr bullet out of a 1:12 barrel.

I also think you would have problems,if you shoot a 36 gr bullet out of a 1:7 twist barrel. Too much rpms may disentegrate the bullet.

Just my deduction from reading and chating,as I have not tested these situations.


Jim

 

Well,
I made a decision,
I will be picking up a Savage 11 XP Trophy Hunter this week.

It has 1:9 twist rate , as all my .223 rifles.
I will use it to work up reloads, and do a little Coyote huntin.
It dont have a 24" barrel or a 20" barrel.
I has a 22" barrel.
Comes with accutrigger and Nikon Prostaff 3X9X40 .

I just wantwed something to test loads close to all my rifles.
1:12 twist in H&R rifles was just too far apart.


Jim

 

Will do,

May take a litte while, as weather is still a little nasty.


Jim

 

Sorry it took so long, for me to get around to shooting this one.

I took it out Friday evening, and shot it for the first time.

Suppsedly it was boresighted from factory with the Nikon Prostaff scope. Which, btw, is a perfect match for this rifle.

So ,to check where its POI and POA really are, I shot first shot at 25 yds, POI was 6 " low and 2 " left.
Adjusted scope , 2 shots hit within an inch of center.
Moved to 50 yds, 2 shots 1 " high and 1 " right.
Moved to 100yds, 2 shots 1 1/2" right and 2 "high,

8 clicks down and 6 clicks left on scope should get a dead center.

Guess what, POI was in the bullseye, so I shot 6 rounds ,with all , but 1 touching bullseye ,which is 3/4" dia. All shots off bench ,using padded tripod.
I really like Savage rifles a lot.




Jim